Sound-producing device.



H. A. GAYDON.

SOUND PRODUGING DEVICE.

APPLIUATION FILED JULY s1, 1911.

1,102,260, y Patented July 7, 1914.

HARRY ALFRED G-AYDON, OIE' CROYON, ENGLAND.

SOUNlJ-PROBUCING- DEVICE.

rioeyoo.

Specllcntion of Letters Patent.

Patented July 7, 1914.

Application llled July 31.1911. Serial No. 641,583.

T0 all tti/1,0m 'it may omi/fern.:

Be it known that I, ll'Aanr ALrRso GAY- nos'1 a subject oi' llis Majesty the King of England, residing" at V' lloselea, +i- Inglis road, ddiseoinbe, Croydon. in the county ot' Surrey. Kingdom ot' Vllnglaiul, have invented certain new and useful linprovenients in SoundProducing Devices, of whieli the following is a speeilitaition.

My invention relates to sound producers ol the kind `in which a valve, consisting ot' a ('oinb or grating', the teeth or bars of which are adapted to close the spaces between the tet-th or bars of a like eonib or grating 'forming the valve seat, controls passages of elastic fluid thus producing the sound. ln sound produeers oit' this kind the valve has been carried by u torsional spring support mounted at each end in bearings arranged upon the valve seat so as to be adjustable. whereby the distance of the valve from its Seat may be varied. rl`hus the torsional spring constitutes the fulcruin of the lever Consisting o" the valve and the p1eee that holds the stylus.

By my invention I am enabled lo use a lighter torsional spring by providing a separate `fulcruin for the lever system compris ing the valve. For this purpose the pieee that, holds the stylus is provided with4 a shoulder to which the torsional spring `is {ixed and takes under the block in which the 'valve seat is mounted; between this block and the shoulder are one orf more balls or projections 4which serve as the said fulerum, This eopstruetion allows of the ends 'of the torsional spring being mounted in 'pieces adjustable on the under surface of the bloek carrying the valve seat, thus al'- fouling; a more readily accessible adjustnient than that ati'orded when the bearings ot' the springl are carried on the face of the valve seat. It also provides greater flexibility in the desired direction. This con-V struction ol the Vpiece that holds the stylus also allows of a very simple adjustine'nt of the spring pressure on the valve which bad anees the elastic fluid pressure. F or this purpose one end of a blade spring may be lixed to the aforesaid shoulder, and the other end may be engaged by a screw spindle extending through the sound box. Another improvement is connected with thedistribution ol the elastic fluid entering the sound box, For improving this distribution I partition the box with wire gauze or the like so that there is an inner compartment on the end wall ol. which the valve seat is Situated, and an outer compartment surroundingr or substantially eo-axial with the inner rolnpartmeut. and packed with eotton-wool or other suitable filtering material.

".lho iuvroinpanving drawings illustrate the invention as applied to the sound producer ol a grainophone, `Figure 1 being a front elevation partly in section. Fig. l is a detail end view oi: one ot' the rotatable elements L. Fig. E2 a side elevation` and Figs. fi and 4 sections on line Emil and fl-Ll respectively of Fig. l.

'lhe valve sont a is mounted in a bl'oek b whieh is attached by screws to the sound box, with interposition of a rubben'm like washer e, As shown in Fig, 3, the hars of the grating: forming this valve seat are tapered in cross seetion, the narrowed side of tho bar beingr turned tovard the sound box. The valve IZ is also a grating, the bals of which taper in.eross section in the oppo site dirertion to the taper of the cross seeton olthe valve seat bars. As shown in lfig. l. the. bars of upwardly. This eonstruetion of the bars of the lvalve and the seat is known and does not lornr a part of iny invention. The valve is carried in lgnown manner by the piece e in which the. stylus is mounted, the valve being here shown as rast in one with the said pieve but it obviously may be constructed in two. or more pieces suitably fixed togather.

'lo a shoulder on the piece o is screwed a lat spring; f the ends of whieh are fixed by serews if; to larger screws or pins It to turn in the block l; but to be looked t'herein by screws fi, Screws lf/ are eocentrieally mounted in the pins li, so that when the latter are turned. after' serews i'. have been looseneih the distance ol the valve d from the val/ve seat a is either slightly increased or slightly decreased according to the direetic'in of the rotation. In order to diminish the tration, so as to ing ol the valve, the under surface of the block I) carries two rounded pro'eotions k against which the piece e is hel spring j', and which thus become the fulorurn whereon the piece e turns when the valve is lifted. The pressure required to lift the valve is adjusted through spring Z3;

one end o'l? which is fixed to the piece e while the other end is slotted to receive the the valve seat also taper' adapted facilitate the liftd by ithe n 

